934 lines
25 KiB
C
934 lines
25 KiB
C
/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
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* Junior University
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*
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* We are making the OpenFlow specification and associated documentation
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* (Software) available for public use and benefit with the expectation
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* that others will use, modify and enhance the Software and contribute
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* those enhancements back to the community. However, since we would
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* like to make the Software available for broadest use, with as few
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* restrictions as possible permission is hereby granted, free of
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* charge, to any person obtaining a copy of this Software to deal in
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* the Software under the copyrights without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* The name and trademarks of copyright holder(s) may NOT be used in
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* advertising or publicity pertaining to the Software or any
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* derivatives without specific, written prior permission.
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*/
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#include <config.h>
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#include "vconn-ssl.h"
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#include "dhparams.h"
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#include <assert.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <string.h>
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#include <netinet/tcp.h>
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#include <openssl/err.h>
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#include <openssl/ssl.h>
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#include <poll.h>
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#include <unistd.h>
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#include "buffer.h"
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#include "socket-util.h"
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#include "util.h"
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#include "openflow.h"
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#include "packets.h"
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#include "poll-loop.h"
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#include "ofp-print.h"
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#include "socket-util.h"
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#include "vconn.h"
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#include "vlog.h"
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#define THIS_MODULE VLM_vconn_ssl
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/* Active SSL. */
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enum ssl_state {
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STATE_TCP_CONNECTING,
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STATE_SSL_CONNECTING
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};
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enum session_type {
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CLIENT,
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SERVER
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};
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struct ssl_vconn
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{
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struct vconn vconn;
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enum ssl_state state;
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int connect_error;
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enum session_type type;
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int fd;
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SSL *ssl;
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struct buffer *rxbuf;
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struct buffer *txbuf;
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struct poll_waiter *tx_waiter;
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/* rx_want and tx_want record the result of the last call to SSL_read()
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* and SSL_write(), respectively:
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*
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* - If the call reported that data needed to be read from the file
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* descriptor, the corresponding member is set to SSL_READING.
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*
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* - If the call reported that data needed to be written to the file
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* descriptor, the corresponding member is set to SSL_WRITING.
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*
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* - Otherwise, the member is set to SSL_NOTHING, indicating that the
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* call completed successfully (or with an error) and that there is no
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* need to block.
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*
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* These are needed because there is no way to ask OpenSSL what a data read
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* or write would require without giving it a buffer to receive into or
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* data to send, respectively. (Note that the SSL_want() status is
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* overwritten by each SSL_read() or SSL_write() call, so we can't rely on
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* its value.)
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*
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* A single call to SSL_read() or SSL_write() can perform both reading
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* and writing and thus invalidate not one of these values but actually
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* both. Consider this situation, for example:
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*
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* - SSL_write() blocks on a read, so tx_want gets SSL_READING.
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*
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* - SSL_read() laters succeeds reading from 'fd' and clears out the
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* whole receive buffer, so rx_want gets SSL_READING.
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*
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* - Client calls vconn_wait(WAIT_RECV) and vconn_wait(WAIT_SEND) and
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* blocks.
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*
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* - Now we're stuck blocking until the peer sends us data, even though
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* SSL_write() could now succeed, which could easily be a deadlock
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* condition.
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*
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* On the other hand, we can't reset both tx_want and rx_want on every call
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* to SSL_read() or SSL_write(), because that would produce livelock,
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* e.g. in this situation:
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*
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* - SSL_write() blocks, so tx_want gets SSL_READING or SSL_WRITING.
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*
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* - SSL_read() blocks, so rx_want gets SSL_READING or SSL_WRITING,
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* but tx_want gets reset to SSL_NOTHING.
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*
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* - Client calls vconn_wait(WAIT_RECV) and vconn_wait(WAIT_SEND) and
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* blocks.
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*
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* - Client wakes up immediately since SSL_NOTHING in tx_want indicates
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* that no blocking is necessary.
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*
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* The solution we adopt here is to set tx_want to SSL_NOTHING after
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* calling SSL_read() only if the SSL state of the connection changed,
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* which indicates that an SSL-level renegotiation made some progress, and
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* similarly for rx_want and SSL_write(). This prevents both the
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* deadlock and livelock situations above.
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*/
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int rx_want, tx_want;
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};
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/* SSL context created by ssl_init(). */
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static SSL_CTX *ctx;
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/* Required configuration. */
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static bool has_private_key, has_certificate, has_ca_cert;
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static int ssl_init(void);
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static int do_ssl_init(void);
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static bool ssl_wants_io(int ssl_error);
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static void ssl_close(struct vconn *);
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static int interpret_ssl_error(const char *function, int ret, int error,
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int *want);
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static void ssl_tx_poll_callback(int fd, short int revents, void *vconn_);
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static DH *tmp_dh_callback(SSL *ssl, int is_export UNUSED, int keylength);
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short int
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want_to_poll_events(int want)
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{
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switch (want) {
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case SSL_NOTHING:
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NOT_REACHED();
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case SSL_READING:
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return POLLIN;
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case SSL_WRITING:
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return POLLOUT;
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default:
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NOT_REACHED();
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}
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}
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static int
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new_ssl_vconn(const char *name, int fd, enum session_type type,
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enum ssl_state state, const struct sockaddr_in *sin,
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struct vconn **vconnp)
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{
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struct ssl_vconn *sslv;
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SSL *ssl = NULL;
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int on = 1;
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int retval;
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/* Check for all the needful configuration. */
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if (!has_private_key) {
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VLOG_ERR("Private key must be configured to use SSL");
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goto error;
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}
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if (!has_certificate) {
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VLOG_ERR("Certificate must be configured to use SSL");
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goto error;
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}
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if (!has_ca_cert) {
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VLOG_ERR("CA certificate must be configured to use SSL");
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goto error;
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}
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if (!SSL_CTX_check_private_key(ctx)) {
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VLOG_ERR("Private key does not match certificate public key");
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goto error;
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}
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/* Disable Nagle. */
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retval = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on);
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if (retval) {
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VLOG_ERR("%s: setsockopt(TCP_NODELAY): %s", name, strerror(errno));
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close(fd);
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return errno;
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}
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/* Create and configure OpenSSL stream. */
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ssl = SSL_new(ctx);
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if (ssl == NULL) {
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VLOG_ERR("SSL_new: %s", ERR_error_string(ERR_get_error(), NULL));
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close(fd);
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return ENOPROTOOPT;
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}
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if (SSL_set_fd(ssl, fd) == 0) {
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VLOG_ERR("SSL_set_fd: %s", ERR_error_string(ERR_get_error(), NULL));
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goto error;
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}
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/* Create and return the ssl_vconn. */
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sslv = xmalloc(sizeof *sslv);
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sslv->vconn.class = &ssl_vconn_class;
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sslv->vconn.connect_status = EAGAIN;
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sslv->vconn.ip = sin->sin_addr.s_addr;
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sslv->state = state;
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sslv->type = type;
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sslv->fd = fd;
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sslv->ssl = ssl;
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sslv->rxbuf = NULL;
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sslv->txbuf = NULL;
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sslv->tx_waiter = NULL;
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sslv->rx_want = sslv->tx_want = SSL_NOTHING;
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*vconnp = &sslv->vconn;
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return 0;
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error:
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if (ssl) {
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SSL_free(ssl);
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}
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close(fd);
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return ENOPROTOOPT;
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}
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static struct ssl_vconn *
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ssl_vconn_cast(struct vconn *vconn)
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{
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assert(vconn->class == &ssl_vconn_class);
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return CONTAINER_OF(vconn, struct ssl_vconn, vconn);
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}
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static int
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ssl_open(const char *name, char *suffix, struct vconn **vconnp)
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{
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char *save_ptr, *host_name, *port_string;
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struct sockaddr_in sin;
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int retval;
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int fd;
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retval = ssl_init();
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if (retval) {
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return retval;
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}
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/* Glibc 2.7 has a bug in strtok_r when compiling with optimization that
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* can cause segfaults here:
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* http://sources.redhat.com/bugzilla/show_bug.cgi?id=5614.
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* Using "::" instead of the obvious ":" works around it. */
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host_name = strtok_r(suffix, "::", &save_ptr);
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port_string = strtok_r(NULL, "::", &save_ptr);
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if (!host_name) {
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error(0, "%s: bad peer name format", name);
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return EAFNOSUPPORT;
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}
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memset(&sin, 0, sizeof sin);
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sin.sin_family = AF_INET;
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if (lookup_ip(host_name, &sin.sin_addr)) {
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return ENOENT;
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}
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sin.sin_port = htons(port_string && *port_string ? atoi(port_string)
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: OFP_SSL_PORT);
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/* Create socket. */
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fd = socket(AF_INET, SOCK_STREAM, 0);
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if (fd < 0) {
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VLOG_ERR("%s: socket: %s", name, strerror(errno));
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return errno;
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}
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retval = set_nonblocking(fd);
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if (retval) {
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close(fd);
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return retval;
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}
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/* Connect socket. */
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retval = connect(fd, (struct sockaddr *) &sin, sizeof sin);
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if (retval < 0) {
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if (errno == EINPROGRESS) {
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return new_ssl_vconn(name, fd, CLIENT, STATE_TCP_CONNECTING,
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&sin, vconnp);
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} else {
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int error = errno;
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VLOG_ERR("%s: connect: %s", name, strerror(error));
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close(fd);
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return error;
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}
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} else {
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return new_ssl_vconn(name, fd, CLIENT, STATE_SSL_CONNECTING,
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&sin, vconnp);
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}
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}
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static int
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ssl_connect(struct vconn *vconn)
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{
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struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
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int retval;
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switch (sslv->state) {
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case STATE_TCP_CONNECTING:
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retval = check_connection_completion(sslv->fd);
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if (retval) {
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return retval;
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}
|
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sslv->state = STATE_SSL_CONNECTING;
|
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/* Fall through. */
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|
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case STATE_SSL_CONNECTING:
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retval = (sslv->type == CLIENT
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? SSL_connect(sslv->ssl) : SSL_accept(sslv->ssl));
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if (retval != 1) {
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int error = SSL_get_error(sslv->ssl, retval);
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if (retval < 0 && ssl_wants_io(error)) {
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return EAGAIN;
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} else {
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int unused;
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interpret_ssl_error((sslv->type == CLIENT ? "SSL_connect"
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: "SSL_accept"), retval, error, &unused);
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shutdown(sslv->fd, SHUT_RDWR);
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return EPROTO;
|
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}
|
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} else {
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return 0;
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}
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}
|
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|
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NOT_REACHED();
|
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}
|
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|
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static void
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ssl_close(struct vconn *vconn)
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{
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struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
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poll_cancel(sslv->tx_waiter);
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SSL_free(sslv->ssl);
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close(sslv->fd);
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free(sslv);
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}
|
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|
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static int
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interpret_ssl_error(const char *function, int ret, int error,
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int *want)
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{
|
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*want = SSL_NOTHING;
|
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switch (error) {
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case SSL_ERROR_NONE:
|
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VLOG_ERR("%s: unexpected SSL_ERROR_NONE", function);
|
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break;
|
|
|
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case SSL_ERROR_ZERO_RETURN:
|
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VLOG_ERR("%s: unexpected SSL_ERROR_ZERO_RETURN", function);
|
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break;
|
|
|
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case SSL_ERROR_WANT_READ:
|
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*want = SSL_READING;
|
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return EAGAIN;
|
|
|
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case SSL_ERROR_WANT_WRITE:
|
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*want = SSL_WRITING;
|
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return EAGAIN;
|
|
|
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case SSL_ERROR_WANT_CONNECT:
|
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VLOG_ERR("%s: unexpected SSL_ERROR_WANT_CONNECT", function);
|
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break;
|
|
|
|
case SSL_ERROR_WANT_ACCEPT:
|
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VLOG_ERR("%s: unexpected SSL_ERROR_WANT_ACCEPT", function);
|
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break;
|
|
|
|
case SSL_ERROR_WANT_X509_LOOKUP:
|
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VLOG_ERR("%s: unexpected SSL_ERROR_WANT_X509_LOOKUP", function);
|
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break;
|
|
|
|
case SSL_ERROR_SYSCALL: {
|
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int queued_error = ERR_get_error();
|
|
if (queued_error == 0) {
|
|
if (ret < 0) {
|
|
int status = errno;
|
|
VLOG_WARN("%s: system error (%s)", function, strerror(status));
|
|
return status;
|
|
} else {
|
|
VLOG_WARN("%s: unexpected SSL connection close", function);
|
|
return EPROTO;
|
|
}
|
|
} else {
|
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VLOG_DBG("%s: %s", function, ERR_error_string(queued_error, NULL));
|
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break;
|
|
}
|
|
}
|
|
|
|
case SSL_ERROR_SSL: {
|
|
int queued_error = ERR_get_error();
|
|
if (queued_error != 0) {
|
|
VLOG_DBG("%s: %s", function, ERR_error_string(queued_error, NULL));
|
|
} else {
|
|
VLOG_ERR("%s: SSL_ERROR_SSL without queued error", function);
|
|
}
|
|
break;
|
|
}
|
|
|
|
default:
|
|
VLOG_ERR("%s: bad SSL error code %d", function, error);
|
|
break;
|
|
}
|
|
return EIO;
|
|
}
|
|
|
|
static int
|
|
ssl_recv(struct vconn *vconn, struct buffer **bufferp)
|
|
{
|
|
struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
|
|
struct buffer *rx;
|
|
size_t want_bytes;
|
|
int old_state;
|
|
ssize_t ret;
|
|
|
|
if (sslv->rxbuf == NULL) {
|
|
sslv->rxbuf = buffer_new(1564);
|
|
}
|
|
rx = sslv->rxbuf;
|
|
|
|
again:
|
|
if (sizeof(struct ofp_header) > rx->size) {
|
|
want_bytes = sizeof(struct ofp_header) - rx->size;
|
|
} else {
|
|
struct ofp_header *oh = rx->data;
|
|
size_t length = ntohs(oh->length);
|
|
if (length < sizeof(struct ofp_header)) {
|
|
VLOG_ERR("received too-short ofp_header (%zu bytes)", length);
|
|
return EPROTO;
|
|
}
|
|
want_bytes = length - rx->size;
|
|
if (!want_bytes) {
|
|
*bufferp = rx;
|
|
sslv->rxbuf = NULL;
|
|
return 0;
|
|
}
|
|
}
|
|
buffer_prealloc_tailroom(rx, want_bytes);
|
|
|
|
/* Behavior of zero-byte SSL_read is poorly defined. */
|
|
assert(want_bytes > 0);
|
|
|
|
old_state = SSL_get_state(sslv->ssl);
|
|
ret = SSL_read(sslv->ssl, buffer_tail(rx), want_bytes);
|
|
if (old_state != SSL_get_state(sslv->ssl)) {
|
|
sslv->tx_want = SSL_NOTHING;
|
|
if (sslv->tx_waiter) {
|
|
poll_cancel(sslv->tx_waiter);
|
|
ssl_tx_poll_callback(sslv->fd, POLLIN, vconn);
|
|
}
|
|
}
|
|
sslv->rx_want = SSL_NOTHING;
|
|
|
|
if (ret > 0) {
|
|
rx->size += ret;
|
|
if (ret == want_bytes) {
|
|
if (rx->size > sizeof(struct ofp_header)) {
|
|
*bufferp = rx;
|
|
sslv->rxbuf = NULL;
|
|
return 0;
|
|
} else {
|
|
goto again;
|
|
}
|
|
}
|
|
return EAGAIN;
|
|
} else {
|
|
int error = SSL_get_error(sslv->ssl, ret);
|
|
if (error == SSL_ERROR_ZERO_RETURN) {
|
|
/* Connection closed (EOF). */
|
|
if (rx->size) {
|
|
VLOG_WARN("SSL_read: unexpected connection close");
|
|
return EPROTO;
|
|
} else {
|
|
return EOF;
|
|
}
|
|
} else {
|
|
return interpret_ssl_error("SSL_read", ret, error, &sslv->rx_want);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
ssl_clear_txbuf(struct ssl_vconn *sslv)
|
|
{
|
|
buffer_delete(sslv->txbuf);
|
|
sslv->txbuf = NULL;
|
|
sslv->tx_waiter = NULL;
|
|
}
|
|
|
|
static void
|
|
ssl_register_tx_waiter(struct vconn *vconn)
|
|
{
|
|
struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
|
|
sslv->tx_waiter = poll_fd_callback(sslv->fd,
|
|
want_to_poll_events(sslv->tx_want),
|
|
ssl_tx_poll_callback, vconn);
|
|
}
|
|
|
|
static int
|
|
ssl_do_tx(struct vconn *vconn)
|
|
{
|
|
struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
|
|
|
|
for (;;) {
|
|
int old_state = SSL_get_state(sslv->ssl);
|
|
int ret = SSL_write(sslv->ssl, sslv->txbuf->data, sslv->txbuf->size);
|
|
if (old_state != SSL_get_state(sslv->ssl)) {
|
|
sslv->rx_want = SSL_NOTHING;
|
|
}
|
|
sslv->tx_want = SSL_NOTHING;
|
|
if (ret > 0) {
|
|
buffer_pull(sslv->txbuf, ret);
|
|
if (sslv->txbuf->size == 0) {
|
|
return 0;
|
|
}
|
|
} else {
|
|
int ssl_error = SSL_get_error(sslv->ssl, ret);
|
|
if (ssl_error == SSL_ERROR_ZERO_RETURN) {
|
|
VLOG_WARN("SSL_write: connection closed");
|
|
return EPIPE;
|
|
} else {
|
|
return interpret_ssl_error("SSL_write", ret, ssl_error,
|
|
&sslv->tx_want);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
ssl_tx_poll_callback(int fd UNUSED, short int revents UNUSED, void *vconn_)
|
|
{
|
|
struct vconn *vconn = vconn_;
|
|
struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
|
|
int error = ssl_do_tx(vconn);
|
|
if (error != EAGAIN) {
|
|
ssl_clear_txbuf(sslv);
|
|
} else {
|
|
ssl_register_tx_waiter(vconn);
|
|
}
|
|
}
|
|
|
|
static int
|
|
ssl_send(struct vconn *vconn, struct buffer *buffer)
|
|
{
|
|
struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
|
|
|
|
if (sslv->txbuf) {
|
|
return EAGAIN;
|
|
} else {
|
|
int error;
|
|
|
|
sslv->txbuf = buffer;
|
|
error = ssl_do_tx(vconn);
|
|
switch (error) {
|
|
case 0:
|
|
ssl_clear_txbuf(sslv);
|
|
return 0;
|
|
case EAGAIN:
|
|
ssl_register_tx_waiter(vconn);
|
|
return 0;
|
|
default:
|
|
sslv->txbuf = NULL;
|
|
return error;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
ssl_wait(struct vconn *vconn, enum vconn_wait_type wait)
|
|
{
|
|
struct ssl_vconn *sslv = ssl_vconn_cast(vconn);
|
|
|
|
switch (wait) {
|
|
case WAIT_CONNECT:
|
|
if (vconn_connect(vconn) != EAGAIN) {
|
|
poll_immediate_wake();
|
|
} else {
|
|
switch (sslv->state) {
|
|
case STATE_TCP_CONNECTING:
|
|
poll_fd_wait(sslv->fd, POLLOUT);
|
|
break;
|
|
|
|
case STATE_SSL_CONNECTING:
|
|
/* ssl_connect() called SSL_accept() or SSL_connect(), which
|
|
* set up the status that we test here. */
|
|
poll_fd_wait(sslv->fd,
|
|
want_to_poll_events(SSL_want(sslv->ssl)));
|
|
break;
|
|
|
|
default:
|
|
NOT_REACHED();
|
|
}
|
|
}
|
|
break;
|
|
|
|
case WAIT_RECV:
|
|
if (sslv->rx_want != SSL_NOTHING) {
|
|
poll_fd_wait(sslv->fd, want_to_poll_events(sslv->rx_want));
|
|
} else {
|
|
poll_immediate_wake();
|
|
}
|
|
break;
|
|
|
|
case WAIT_SEND:
|
|
if (!sslv->txbuf) {
|
|
/* We have room in our tx queue. */
|
|
poll_immediate_wake();
|
|
} else {
|
|
/* The call to ssl_tx_poll_callback() will wake us up. */
|
|
}
|
|
break;
|
|
|
|
default:
|
|
NOT_REACHED();
|
|
}
|
|
}
|
|
|
|
struct vconn_class ssl_vconn_class = {
|
|
.name = "ssl",
|
|
.open = ssl_open,
|
|
.close = ssl_close,
|
|
.connect = ssl_connect,
|
|
.recv = ssl_recv,
|
|
.send = ssl_send,
|
|
.wait = ssl_wait,
|
|
};
|
|
|
|
/* Passive SSL. */
|
|
|
|
struct pssl_vconn
|
|
{
|
|
struct vconn vconn;
|
|
int fd;
|
|
};
|
|
|
|
static struct pssl_vconn *
|
|
pssl_vconn_cast(struct vconn *vconn)
|
|
{
|
|
assert(vconn->class == &pssl_vconn_class);
|
|
return CONTAINER_OF(vconn, struct pssl_vconn, vconn);
|
|
}
|
|
|
|
static int
|
|
pssl_open(const char *name, char *suffix, struct vconn **vconnp)
|
|
{
|
|
struct sockaddr_in sin;
|
|
struct pssl_vconn *pssl;
|
|
int retval;
|
|
int fd;
|
|
unsigned int yes = 1;
|
|
|
|
retval = ssl_init();
|
|
if (retval) {
|
|
return retval;
|
|
}
|
|
|
|
/* Create socket. */
|
|
fd = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (fd < 0) {
|
|
int error = errno;
|
|
VLOG_ERR("%s: socket: %s", name, strerror(error));
|
|
return error;
|
|
}
|
|
|
|
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof yes) < 0) {
|
|
int error = errno;
|
|
VLOG_ERR("%s: setsockopt(SO_REUSEADDR): %s", name, strerror(errno));
|
|
return error;
|
|
}
|
|
|
|
memset(&sin, 0, sizeof sin);
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_addr.s_addr = htonl(INADDR_ANY);
|
|
sin.sin_port = htons(atoi(suffix) ? atoi(suffix) : OFP_SSL_PORT);
|
|
retval = bind(fd, (struct sockaddr *) &sin, sizeof sin);
|
|
if (retval < 0) {
|
|
int error = errno;
|
|
VLOG_ERR("%s: bind: %s", name, strerror(error));
|
|
close(fd);
|
|
return error;
|
|
}
|
|
|
|
retval = listen(fd, 10);
|
|
if (retval < 0) {
|
|
int error = errno;
|
|
VLOG_ERR("%s: listen: %s", name, strerror(error));
|
|
close(fd);
|
|
return error;
|
|
}
|
|
|
|
retval = set_nonblocking(fd);
|
|
if (retval) {
|
|
close(fd);
|
|
return retval;
|
|
}
|
|
|
|
pssl = xmalloc(sizeof *pssl);
|
|
pssl->vconn.class = &pssl_vconn_class;
|
|
pssl->vconn.connect_status = 0;
|
|
pssl->fd = fd;
|
|
*vconnp = &pssl->vconn;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
pssl_close(struct vconn *vconn)
|
|
{
|
|
struct pssl_vconn *pssl = pssl_vconn_cast(vconn);
|
|
close(pssl->fd);
|
|
free(pssl);
|
|
}
|
|
|
|
static int
|
|
pssl_accept(struct vconn *vconn, struct vconn **new_vconnp)
|
|
{
|
|
struct pssl_vconn *pssl = pssl_vconn_cast(vconn);
|
|
struct sockaddr_in sin;
|
|
socklen_t sin_len = sizeof sin;
|
|
char name[128];
|
|
int new_fd;
|
|
int error;
|
|
|
|
new_fd = accept(pssl->fd, &sin, &sin_len);
|
|
if (new_fd < 0) {
|
|
int error = errno;
|
|
if (error != EAGAIN) {
|
|
VLOG_DBG("accept: %s", strerror(error));
|
|
}
|
|
return error;
|
|
}
|
|
|
|
error = set_nonblocking(new_fd);
|
|
if (error) {
|
|
close(new_fd);
|
|
return error;
|
|
}
|
|
|
|
sprintf(name, "ssl:"IP_FMT, IP_ARGS(&sin.sin_addr));
|
|
if (sin.sin_port != htons(OFP_SSL_PORT)) {
|
|
sprintf(strchr(name, '\0'), ":%"PRIu16, ntohs(sin.sin_port));
|
|
}
|
|
return new_ssl_vconn(name, new_fd, SERVER, STATE_SSL_CONNECTING, &sin,
|
|
new_vconnp);
|
|
}
|
|
|
|
static void
|
|
pssl_wait(struct vconn *vconn, enum vconn_wait_type wait)
|
|
{
|
|
struct pssl_vconn *pssl = pssl_vconn_cast(vconn);
|
|
assert(wait == WAIT_ACCEPT);
|
|
poll_fd_wait(pssl->fd, POLLIN);
|
|
}
|
|
|
|
struct vconn_class pssl_vconn_class = {
|
|
.name = "pssl",
|
|
.open = pssl_open,
|
|
.close = pssl_close,
|
|
.accept = pssl_accept,
|
|
.wait = pssl_wait,
|
|
};
|
|
|
|
/*
|
|
* Returns true if OpenSSL error is WANT_READ or WANT_WRITE, indicating that
|
|
* OpenSSL is requesting that we call it back when the socket is ready for read
|
|
* or writing, respectively.
|
|
*/
|
|
static bool
|
|
ssl_wants_io(int ssl_error)
|
|
{
|
|
return (ssl_error == SSL_ERROR_WANT_WRITE
|
|
|| ssl_error == SSL_ERROR_WANT_READ);
|
|
}
|
|
|
|
static int
|
|
ssl_init(void)
|
|
{
|
|
static int init_status = -1;
|
|
if (init_status < 0) {
|
|
init_status = do_ssl_init();
|
|
assert(init_status >= 0);
|
|
}
|
|
return init_status;
|
|
}
|
|
|
|
static int
|
|
do_ssl_init(void)
|
|
{
|
|
SSL_METHOD *method;
|
|
|
|
SSL_library_init();
|
|
SSL_load_error_strings();
|
|
|
|
method = TLSv1_method();
|
|
if (method == NULL) {
|
|
VLOG_ERR("TLSv1_method: %s", ERR_error_string(ERR_get_error(), NULL));
|
|
return ENOPROTOOPT;
|
|
}
|
|
|
|
ctx = SSL_CTX_new(method);
|
|
if (ctx == NULL) {
|
|
VLOG_ERR("SSL_CTX_new: %s", ERR_error_string(ERR_get_error(), NULL));
|
|
return ENOPROTOOPT;
|
|
}
|
|
SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
|
|
SSL_CTX_set_tmp_dh_callback(ctx, tmp_dh_callback);
|
|
SSL_CTX_set_mode(ctx, SSL_MODE_ENABLE_PARTIAL_WRITE);
|
|
SSL_CTX_set_mode(ctx, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
|
|
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
|
|
NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static DH *
|
|
tmp_dh_callback(SSL *ssl, int is_export UNUSED, int keylength)
|
|
{
|
|
struct dh {
|
|
int keylength;
|
|
DH *dh;
|
|
DH *(*constructor)(void);
|
|
};
|
|
|
|
static struct dh dh_table[] = {
|
|
{1024, NULL, get_dh1024},
|
|
{2048, NULL, get_dh2048},
|
|
{4096, NULL, get_dh4096},
|
|
};
|
|
|
|
struct dh *dh;
|
|
|
|
for (dh = dh_table; dh < &dh_table[ARRAY_SIZE(dh_table)]; dh++) {
|
|
if (dh->keylength == keylength) {
|
|
if (!dh->dh) {
|
|
dh->dh = dh->constructor();
|
|
if (!dh->dh) {
|
|
fatal(ENOMEM, "out of memory constructing "
|
|
"Diffie-Hellman parameters");
|
|
}
|
|
}
|
|
return dh->dh;
|
|
}
|
|
}
|
|
VLOG_ERR("no Diffie-Hellman parameters for key length %d", keylength);
|
|
return NULL;
|
|
}
|
|
|
|
/* Returns true if SSL is at least partially configured. */
|
|
bool
|
|
vconn_ssl_is_configured(void)
|
|
{
|
|
return has_private_key || has_certificate || has_ca_cert;
|
|
}
|
|
|
|
void
|
|
vconn_ssl_set_private_key_file(const char *file_name)
|
|
{
|
|
if (ssl_init()) {
|
|
return;
|
|
}
|
|
if (SSL_CTX_use_PrivateKey_file(ctx, file_name, SSL_FILETYPE_PEM) != 1) {
|
|
VLOG_ERR("SSL_use_PrivateKey_file: %s",
|
|
ERR_error_string(ERR_get_error(), NULL));
|
|
return;
|
|
}
|
|
has_private_key = true;
|
|
}
|
|
|
|
void
|
|
vconn_ssl_set_certificate_file(const char *file_name)
|
|
{
|
|
if (ssl_init()) {
|
|
return;
|
|
}
|
|
if (SSL_CTX_use_certificate_chain_file(ctx, file_name) != 1) {
|
|
VLOG_ERR("SSL_use_certificate_file: %s",
|
|
ERR_error_string(ERR_get_error(), NULL));
|
|
return;
|
|
}
|
|
has_certificate = true;
|
|
}
|
|
|
|
void
|
|
vconn_ssl_set_ca_cert_file(const char *file_name)
|
|
{
|
|
STACK_OF(X509_NAME) *ca_list;
|
|
|
|
if (ssl_init()) {
|
|
return;
|
|
}
|
|
|
|
/* Set up list of CAs that the server will accept from the client. */
|
|
ca_list = SSL_load_client_CA_file(file_name);
|
|
if (ca_list == NULL) {
|
|
VLOG_ERR("SSL_load_client_CA_file: %s",
|
|
ERR_error_string(ERR_get_error(), NULL));
|
|
return;
|
|
}
|
|
SSL_CTX_set_client_CA_list(ctx, ca_list);
|
|
|
|
/* Set up CAs for OpenSSL to trust in verifying the peer's certificate. */
|
|
if (SSL_CTX_load_verify_locations(ctx, file_name, NULL) != 1) {
|
|
VLOG_ERR("SSL_CTX_load_verify_locations: %s",
|
|
ERR_error_string(ERR_get_error(), NULL));
|
|
return;
|
|
}
|
|
|
|
has_ca_cert = true;
|
|
}
|